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Balun Cores

Originally designed for balun transformers, matching balanced to unbalanced circuits in the television frequency spectrum, these cores can also be used for wideband and pulse transformers and interference suppression.

The insertion loss of transformers wound on cores manufactured from ferrite grade F14 and connected according to the information presented in the diagrams below, is approximately 0.5dB between 40 and 220 MHz; above 220 MHz the insertion loss gradually increases, reaching 1 dB at 800 MHz.

The diagram below illustrates winding arrangements and the circuit diagrams show alternative connections of a balun transformer designed to match a balanced 300 ohm impedance to an unbalanced 75 ohm impedance. It will be noticed that the only purpose of windings 1 and 2 is to introduce an inductance to balance the leakage inductance of windings 3 and 4 which form a centretapped auto-transformer.

Multi-Aperture cores are designed as suppression components which are compact in size and provide high resistive impedance over a wide frequency band. These cores avoid the self resonance effects experienced with single aperture cores wound with multiple turns. The components listed below are available in a wide variety of materials.

Mechanical Specifications

Part No.   Units   Major OD   Tolerance   Minor
OD		   Tolerance   I.D.   Tolerance   Height   Tolerance   Le
(mm)		   Ae
(mm2)		   Ve
(mm3)		   C1
(cm-1)
G_ _-153Y-2B1/1
 		   in.
mm		   0.138
3.505		   0.008
0.197		   0.081
2.057		   0.007
0.168		   0.034
0.864		   0.005
0.127		   0.040
1.016		   0.006
0.147		   4.059
 		   0.0912
 		   3.70
 		   44.52
 
G_ _-1I41-2D1/1
 		   in.
mm		   0.141
3.581		   0.008
0.199		   0.083
2.108		   0.007
0.169		   0.034
0.864		   0.005
0.127		   0.053
1.346		   0.006
0.154		   4.101
 		   0.1255
 		   5.15
 		   32.69
 
G_ _-1K3Y-2B1/1
 		   in.
mm		   0.138
3.505		   0.008
0.197		   0.081
2.057		   0.007
0.168		   0.034
0.864		   0.005
0.127		   0.055
1.397		   0.006
0.155		   4.059
 		   0.1367
 		   5.55
 		   29.68
 
G_ _-1Q3Y-2B1/1
 		   in.
mm		   0.138
3.505		   0.008
0.197		   0.081
2.057		   0.007
0.168		   0.034
0.864		   0.005
0.127		   0.006
0.157		   0.006
0.154		   4.059
 		   0.1367
 		   5.55
 		   29.68
 
G_ _-1Q41-2D1/1
 		   in.
mm		   0.141
3.581		   0.008
0.199		   0.083
2.108		   0.007
0.169		   0.034
0.864		   0.005
0.127		   0.060
0.1524		   0.006
0.157		   4.101
 		   0.1421
 		   5.83
 		   28.87
 
G_ _-203Y-2B1/1
 		   in.
mm		   0.138
3.505		   0.008
0.197		   0.081
2.057		   0.007
0.168		   0.034
0.864		   0.005
0.127		   0.070
1.778		   0.006
0.163		   4.059
 		   0.1595
 		   6.48
 		   25.44
 
G_ _-2V3Y-2V1/1
 		   in.
mm		   0.138
3.505		   0.008
0.197		   0.081
2.057		   0.007
0.168		   0.034
0.864		   0.005
0.127		   0.100
2.540		   0.007
0.178		   4.059
 		   0.2279
 		   9.25
 		   17.81
 
G_ _-203Y-2B1/1
 		   in.
mm		   0.138
3.505		   0.008
0.197		   0.081
2.057		   0.007
0.168		   0.034
0.864		   0.005
0.127		   0.070
1.778		   0.006
0.163		   4.059
 		   0.1595
 		   6.48
 		   25.44
 
G_ _-2V41-2D1/1
 		   in.
mm		   0.141
3.581		   0.008
0.199		   0.083
2.108		   0.007
0.169		   0.034
0.864		   0.005
0.127		   0.100
2.540		   0.007
0.178		   4.101
 		   0.2368
 		   9.71
 		   17.32
 
G_ _-3K7Q-4F1/1
 		   in.
mm		   0.270
6.858		   0.010
0.264		   0.155
3.937		   0.008
0.206		   0.073
1.854		   0.005
0.127		   0.125
3.175		   0.008
0.191		   8.291
 		   0.5047
 		   41.85
 		   16.43
 
G_ _-5Q4Q-2T1/1
 		   in.
mm		   0.165
4.191		   0.008
0.211		   0.098
2.489		   0.007
0.177		   0.037
0.940		   0.005
0.127		   0.200
5.080		   0.009
0.229		   4.620
 		   0.5822
 		   26.90
 		   7.94
 
G_ _-6Z80-4Q1/1
 		   in.
mm		   0.280
7.112		   0.011
0.269		   0.165
4.191		   0.008
0.211		   0.073
1.854		   0.005
0.127		   0.244
6.198		   0.010
0.251		   8.520
 		   1.0965
 		   93.42
 		   7.77
 
G_ _-757Q-4F1/1
 		   in.
mm		   0.270
6.858		   0.010
0.264		   0.155
3.937		   0.008
0.206		   0.070
1.778		   0.005
0.127		   0.250
6.350		   0.010
0.254		   8.097
 		   1.0408
 		   84.27
 		   7.78
 
G_ _-8K7V-4F1/1
 		   in.
mm		   0.275
6.985		   0.011
0.267		   0.155
3.937		   0.008
0.206		   0.073
1.854		   0.005
0.127		   0.300
7.620		   0.011
0.279		   8.291
 		   1.2114
 		   100.43
 		   6.84
 
G_ _-FKFA-8Q1/1
 		   in.
mm		   0.535
13.589		   0.016
0.399		   0.305
7.747		   0.011
0.282		   0.170
4.318		   0.005
0.127		   0.545
13.843		   0.016
0.404		   17.914
 		   3.6911
 		   661.23
 		   4.85
 
G_ _-1F33-1Q1/1
 		   in.
mm		   0.108
2.743		   0.007
0.182		   0.060
1.524		   0.006
0.157		   0.022
0.559		   0.005
0.127		   0.050
1.270		   0.006
0.152		   2.781
 		   0.0902
 		   2.51
 		   30.82
 
G_ _-1V3Y-2B1/1
 		   in.
mm		   0.138
3.505		   0.008
0.197		   0.081
2.057		   0.007
0.168		   0.034
0.864		   0.005
0.127		   0.065
1.651		   0.006
0.160		   4.059
 		   0.1481
 		   6.01
 		   27.40
 
G_ _-3K80-4Q1/1
 		   in.
mm		   0.280
7.112		   0.011
0.269		   0.165
4.191		   0.008
0.211		   0.073
1.854		   0.005
0.127		   0.125
3.175		   0.008
0.191		   8.520
 		   0.5617
 		   47.86
 		   15.17
 
G_ _-BQF0-8F1/1
 		   in.
mm		   0.525
13.335		   0.016
0.394		   0.295
7.493		   0.011
0.277		   0.150
3.810		   0.005
0.127		   0.410
10.414		   0.013
0.335		   16.470
 		   2.9540
 		   486.53
 		   5.58
 

AL Values
Part No.   F31   F21   F01   F302   FA1   F52   F53   FF1  |  FB2   F9Q   F9N   F82   FT6   FT7   FTA
G_ _-153Y-2B1/1   4.2   11   34   99   104   240   296   423   564   649   1129   1411   1693   2117   2822
G_ _-1I41-2D1/1   5.8   15   46   135   142   327   404   577   769   884   1538   1922   2307   2883   3845
G_ _-1K3Y-2B1/1   5.8   16   47   136   144   330   407   582   776   893   1552   1940   2328   2911   3881
G_ _-1Q3Y-2B1/1   6.4   17   51   148   157   360   445   635   847   974   1693   2117   2540   3175   4233
G_ _-1Q41-2D1/1   6.5   17   52   152   161   370   457   653   870   1001   1741   2176   2611   3264   4352
G_ _-203Y-2B1/1   7.4   20   59   173   183   420   519   741   988   1136   1976   2470   2963   3704   4939
G_ _-2V3Y-2V1/1   10.6   28   85   247   261   600   741   1058   1411   1623   2822   3528   4233   5292   7056
G_ _-2V41-2D1/1   10.9   29   87   254   268   617   762   1088   1451   1668   2902   3627   4352   5441   7254
G_ _-3K7Q-4F1/1   11.5   31   92   268   283   650   803   1148   1530   1760   3060   3825   4590   5738   7650
G_ _-3K7V-4F1/1   11.5   31   92   268   283   650   803   1148   1530   1760   3060   3825   4590   5738   7650
G_ _-5Q4Q-2T1/1   23.8   63   190   554   586   1346   1663   2375   3167   3642   6334   7917   9500   11876   15834
G_ _-6Z80-4Q1/1   24.3   65   194   566   598   1375   1698   2426   3235   3720   6469   8086   9704   12130   16173
G_ _-757Q-4F1/1   24.2   65   194   565   598   1373   1696   2423   3231   3715   6461   8076   9692   12115   16153
G_ _-8K7V-4F1/1   27.5   73   220   643   679   1561   1928   2754   3672   4223   7344   9180   11016   13770   18360
G_ _-FKFA-8Q1/1   38.8   104   311   906   958   2201   2719   3884   5179   5955   10357   12946   15536   19419   25893
G_ _-1F33-1Q1/1   6.1   16   49   143   151   347   428   612   815   938   1631   2039   2446   3058   4077
G_ _-1V3Y-2B1/1   6.9   18   55   161   170   390   482   688   917   1055   1635   2293   2752   3440   4586
G_ _-3K80-4Q1/1   12.4   33   99   290   307   704   870   1243   1657   1906   3314   4143   4971   6214   8285
G_ _-BQF0-8F1/1   33.8   90   270   789   834   1916   2367   3381   4508   5184   9016   11269   13523   16904   22539

_ _ is reserved for material designation.

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